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math

posted by on .

Solve and simplify

(3+9i)-(12-5i)



8+6i/7-5i

  • 1 out of 2 - ,

    Rewrite as:

    3+9i-12+5i

    Add like terms:

    -9+14i is your answer.

  • math - ,

    for the 2nd, multiply top and bottom by 7+5i

    (8+6i)/(7-5i) * (7+5i)/(7+5i)
    =(56 + 40i + 42i + 30i^2)/(48 - 25i^2)
    = (26 + 82i)/73 . remember i^2 = -1

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